we need to protect their environment. we have a strict quarantine system to protect the integrity of the environment. forty years on, it's still a class-a nature reserve. it's our job to look after them. ...it's my job to look after it. ♪ >>> it is really very hard to tell at this point how long the investigation will take. what i can tell you is that we have all hands on deck. we are working as hard as we can to identify what the failure mode is here and what corrective actions need to be taken. >> all right. so investigators still don't know what cause ad battery fire on board this airplane in boston earlier this month and that spells more bad news for boeing. the company's flagship dreamliner fleet now grounded for the past nine days. no end in sight, frankly. here now is former american airlines chairman bob crandall and jonathan salem baskin. mr. bob crandall it's a pleasure to see you, sir. happy new year. i want to ask you what the national transportation board said late this afternoon, okay. they looked at this